in cleaning the lot of my or ww2 guns i saw what i thought was to be rust. showed a friend and he said that it looked more like wear on the rifling. so how do i tell what it is and then fix the problem. after cleaned the barrels are nice and shiny, then looking at the tops of the barrels in with a flashlight it appears that the bores have a rust color in them in certain areas... dont really know what it is.. any help?